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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f94d6322106c2485077bf42112158706a548ca6bdb83ebf2b3c95091a430ef' 
  AND token = '2QEBIswr3dh/x8v50BZ8fx+zECVIxaEUbhZF2dNGJb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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