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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6567e24d04eaa309930d5a7a75d74d03bdd93616e26c856a8e7002067eb1040a' 
  AND token = 'Idt+5TVQdwNlTd9lolx4CKTnFBF1vJVpPrhiEqxUEF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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