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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae47efd776e14797a1c3128026a83c31f1d255f614a029d6b5a1e8e29a48d071' 
  AND token = 'Z9e1Qqb6vrFTkk5vNm0opEqqIVtgLJEOKLFIBdAQtXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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