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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028d5adffe686837a0148c8296bf7135fc555eb877785db7b1d11fc9c154ed44' 
  AND token = 'bbz4tUrnG9duh/tj3t70NiRd07vRAmkMmeSHzMhxBvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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