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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bafc829f830a9c61aea53db8f3cb051bb959a719f5e9879c61d3e7d09df4c7' 
  AND token = '5gztxa28yN9JxT41A/rMUBbhPR4C1Yz2tFQEBUFXyZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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