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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc8a96a89218ca647806cf76d39f07381c7ba4008636f12496e24a37bab2495' 
  AND token = 'e4mX5xmjltDev/kfSWv+mHa1OP+dJ9TlG+Q4pkgJo3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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