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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36d75b794bd97a58b18bab99fe3794fc4a98ef7b0907999e8bb9c5c55e53f7e' 
  AND token = '1sRyYb72fWzZChWDG+Pxn8/dUt9HhV+av5dOrF4uGfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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