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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244f718324f6106a6c3f91281d96a1fa80261147007b33cb5f0c68d66d0ddbcd' 
  AND token = 'Fjr+H4NOY3uPZ7Yq8MY0TVBzI8J/BMEKE6cLK4A2X+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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