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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773c291a33aa6c615a0fd709658d6c914b50e9822d4249f1e2fc11395208ceda' 
  AND token = 'RB234jvEWDwiVLuX3d4UejOED0SUTd1u8bIj+sqiX6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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