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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb1ff452f17c513c7f3667d4fae6fcaddc2520bcc7540f159bd45cf0615f6ce' 
  AND token = '4FVe5kR5qMCnRCY0TrWMzb7McBZ0PqaHcUWcYa0Kj64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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