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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc7b730405e59db5703843ed73ebd67b33866dcd531e0bdef4f94d6d198a37e' 
  AND token = 'sb2ghKseWmXv9hCa0YN0wS3iLZr2Q3sn4wIQ+nNrfd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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