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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb058a43cf355752fc426a94295d75e3bb3e0c0bc76fc91a5c3aaaf12a9511a0' 
  AND token = 'sUkaT7lTiQK9U9e7k4M0mFZFwx5pqtPP4Uh2xMM2AZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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