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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237299aed954803d5d2a887ebec8bc2ed57bb632a96bf8bc2a700f402b50133c' 
  AND token = 'sp2TmLibgssWNtxgE9N7xv9hPKg+UAX2wC5JglaSWhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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