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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8dd44d14b3add452f5a7c59986237d6f83c4444f0bd2086b40e18097aa52d1c' 
  AND token = 'warkeoIyBziXmfcALiLdjfWIB0hfGSFBCltDAmNUZ8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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