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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957b9cb4021b17dac52a76fa3e88d2c3527a52f7586ef2b95f6b1f6cd8697da0' 
  AND token = 'ehMqxNTdcuwLDvHJ9KvqU0XhTiabVrAyu/14RpF7Atw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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