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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71034e3698815b26a7b41ba07a92b7be6e607f92809f27c2187c609da47f4c5' 
  AND token = '9nP6ArtDg9/7RG1mrHcb9+ogJrukHh0Ki0zA98y3SPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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