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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844eea7b405df4b2dadf24b53dc20f1012257c6f9cedede55bf22be80bad6883' 
  AND token = 'Yl3KJhPy8mj2TmeK4yHaraBRdcOOUBjdiFHrBUfE72c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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