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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c4fea12b20e55885d680c6e4d24b6ebdce6c1d956ecb9e366894a9a78feb2b' 
  AND token = 'dAlOREb6cIxWsfTidPUKmGyKYvrET59xkUp6V/Gq8ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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