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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ace16916dea5f9cab272343b4836e935329ada9eb9a0bcb9579aed1290e2f61' 
  AND token = 'vjJry3t3M4sTdFxmpiu4+5YnotjbmrRxr0Od3QY7n2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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