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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b41edcda1dc78715d5ed581dad80f483ed176f4e0f0bd43f7b10d6d2d971a2' 
  AND token = 'C1G+sq/SgduMzj6mggkDwGwC5CcqNRh+6rJwfiJB10Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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