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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74aa6463f06fbfa29867ded1fc4ec860b8d3b3ef52e25196da574fcf9e49bd1e' 
  AND token = 'wkVdz2z1HbzqshRV6LySsAiCqdpvBXWA7fR3dmhFUTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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