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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba972e17913e9aa4caf77f70684c5694773d2aff3630d3e81dd68679e34290f' 
  AND token = 'dLKp4ac9s7y7zkF8jW/gFJwBEfO/oAhwoiJ12YkpIyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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