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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9098bef0688ae6a3d3973940c9531b6a02986f1fedc86cec8864e733e77d7794' 
  AND token = 'wj2yrWLHmbqmmRYv/U/abuc7ZLOelv2c5o9IXNZoecA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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