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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e530e129de12b5aea6b6cba8430cfb174fa27eda5bfbd6f5a5c07a05672d8c0c' 
  AND token = 'wMEa41e1h7JLJuYMv23/xUaWtub9M56d9ndsTSnO/xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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