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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aff2f8c3b84fdf0d4600395ac1946ce0342adfb644b1dda431eb6d2b9c8f242' 
  AND token = 'y2WJkcAq6fwRerWgeq+p53+W7NQ93CsDZ8he+rz5Q6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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