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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224d7a7df4c66663b350aab48a1f35b4594eb55faa3c57b73007c6bf43862ea8' 
  AND token = 'WPE38CctiEGYQVT1vFvx1vFQPzuYUVRZFUE5LiL608U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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