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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbdf8e9776619dbb9281b434715d7c16977098b1682a6549f2e3c7b53e89bc7d' 
  AND token = 'fEQzoeo0lm2sjc2GzeRnXCXp+FIPFw3E7XBRZT8DtqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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