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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3f487a2ab650ccca177d65ba353b60efa1e80acad01872668b312c235cf41d' 
  AND token = 'H3KPFF1/oQW39pTCh9aG6GiU80c5vf29PdWJcMXM2b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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