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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca32e7898ef946f22e90c7b569d2b812b0adfd46d58a807960ef587edfcbbebf' 
  AND token = 'XNii9j5Ie92yclIRDHrzmzZIbIzOVS9E4g/gOd4UePk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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