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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab48e3c4b18daa04c5839ae7472af1a5167c64cde8582079d5ddd539a7d7e91' 
  AND token = 'tl90SQ6OBsCY+MWrEDOzgT50oTP8PNvpVatP+lIr3Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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