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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97dc643b7f00f70bf245dfaacfecc91ba39500d9e0010e943119d65f7538ea7c' 
  AND token = '5PyM3Gqw5VjL6qAekE6KsgF9efUNPgdkOMvnYoTk+30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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