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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '427435f292c7b1aa2d60ad7d872bd2eb76ff247910e93dda75eae1a452e76f17' 
  AND token = 'y7lDXaXIEM4IPWC15/7SLJPTEzDxeKNTGXbSYfHIKkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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