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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ea30cde34c0fc52813c428241572c4480439c664279b339e2a9fecc9998abb' 
  AND token = '/od5EOfFzW8oFSvjNU4ssN+c1JAv7a+jefzac1IZq5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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