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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76ef2384710e654ccec65156b97de6df20b56b0e55a7ecb5bd61e44bec77ed7' 
  AND token = 'NPI5SKEdTXbS4mYQQOVQkDgO2cgVQGZzCCH4lbH8w8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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