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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e116b6a4d254fcd2110626e8fd08a1ebac5e40b916ac4f2b653165dd60de712f' 
  AND token = '1lTxb0lElngKJEn0q3HLze0DD7EwIb4vEd90RlQVucg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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