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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ef71c963aa57ac7c677027225dbf4e0901abd7aa457da909f3fd7f640d1d08' 
  AND token = 'MTuntYZla/0xpUtUTJeu03HtRqo/aP6OVeLqFjEj9PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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