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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536419ee3fdfbe00df0868d7656d56b21368935b5741a8f6cb3216fdf3f69f03' 
  AND token = 'bXHqU4JJ7Ai5kc3U6p6WgwDR/HLaZMo50gHY7439jXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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