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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af77d746d9ba103b22b03fc0487e086d49dc4fd89d6db869d9c9e85e59883833' 
  AND token = 'cxRQjcVjyXBI1rKLGgLOHzXdninxvEfFk7NQ1Hp+4a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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