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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97ed9f79643743a8684c29fa712ea825e6aa817cdadc7d27d428414ff6beee7' 
  AND token = '16umfKY0Dei15oaTPCRnjFcl4aM+DtWZLiEagc3KKaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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