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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314c013132f21f97f5f76df38d8860cd6adf62a9be73314ee23e82ac02106a5b' 
  AND token = 'icm+HWEQPphjDkjUxodZ+lxro6kdNj1cp8cdbReLc10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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