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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b698707d6a00e54be054ea71bd6db682e9ad95a45b05cc397810b083c28f5e7' 
  AND token = 'tX+NfbjXzI5ksfRPNtu/Pm9Rg6vHzTNfFB6kmY6ye+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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