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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9238f832e396d9f6b63ed0d71bee7cfe04937b3f8e9f24f11c4f6c9dd5483ba6' 
  AND token = 'hJLBCHgI1jf+87xsYYo0FE7meMOA7NjLEmqaRDpRFXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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