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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c49c11a7f82f5cd401fa3ce3b4d624d580c7cf4db52a107cc4df587ac00394' 
  AND token = 'AGWDIndR8eMzZM6Fl0822cEzOBGayEZmvnCVjHisnII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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