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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5872c49bda6e05b584c07bc74b1f5a701e1ca5a6256e8480d51d8386a4cddf35' 
  AND token = 'gkBm25at4ivQDKYxbCdd4gdAGBsWWCrgM2AkbX2FREk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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