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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c234adf5f1f691e6e91c5d4ed0f737b35b142b2270ff2bc9c7c5d77663a5df' 
  AND token = 'yFcHv8OMptX2peLKCrmm64UY463f2yritfAW+3/tFHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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