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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae9ea806fe728fc976f56597bbeaab36c86bf2fb34aa8a32e0419ce6fdd9c9b' 
  AND token = 'kaEtz19MRO6W0JZ8STYkao2uqDOIlsEmakB/i+4t/Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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