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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a76e689f0a622d519566022077ca72fd8ac68c37ce02379279276a14fbb66ce' 
  AND token = 'BTBd0HPTX+iAndFZ4gFNAPBQRgD522PQleoiXDCtTys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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