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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa372ec9937b7a716d6e55268662ae533683e6600b5fd32e96a5e6b954396145' 
  AND token = '3oDBO2LD+LpuvINklRHnteWxSkATUfFyAl1SSv7f3As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}