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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11c137aaf7b8d8f51a46ee785f4af403cb47e65112c33663ca032622faacfab' 
  AND token = 'vKqMcfZ0DJ748eYWsF3MYFvzT9bW3+JO+4X74UIAttQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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