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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79dd4ab0b728a633af3a7f93b3695b37de7f77daad1f074b6f579bfff71dcb02' 
  AND token = 'XKV6hXsJz0F2YQEdJ6XZSzseVFEfQo4qikc688y3PR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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