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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71a67a0c28b66908ab783667e0f373910229b0f077e539c97c53cb96c0c31ad' 
  AND token = 'rXuSpnisxXwrEDXzg9vt1W5NUjHsIgW7GtrVfbDrWm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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