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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25da07b5c4a5eec428b2f3c62fa2ed867f96a0919ee6fb49c34bbd7e0076acfe' 
  AND token = 'VK12JXF3T/1+O0PfhVjMh25pPk4Puuw4DuUryze62Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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