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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f03b2060f4d3d31d14a70ab68eb87f669fd4b71244e48edab0b566000ac10a' 
  AND token = 'qELX8s17Ud/w6jSaWc5VKJEekgzBla/T6tFFMdDNoVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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