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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa6c4fc29d6a993cc2dd6b30ab8b5c3f4a75e06c5919ed35cb660eca7bc186e' 
  AND token = 'RpHRUIrcuyYAN8UJ1h4U/VMbNOPqX48HD/XbS30Rfqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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