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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8631512ecfe4a4de0cd0c38b10c4b020a4d1edf7cdbd8becd77aff7779e6ec35' 
  AND token = 'xt7f55uz0RtBSNpqFdCzMMt47BuwQjtj5IoFdVWJRJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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